7.6. SR 07-17-2017 - Laserfiche WebLink

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6. Noise: The mining operation as well as loading and trucking operations will operate in compliance with all State noise standards. State standards have been established for daytime hours, defined as 7:00 a.m. to 10:00 p.m. and nighttime hours defined as 10:00 p.m. to 7:00 a.m. Nighttime standards are more restrictive for residential receptors. The Site currently operates processing equipment during nighttime hours and is therefore subject to both daytime and nighttime residential standards. Table 1.1 Minnesota Noise Standards for Residential Land Uses Daytime Nighttime Lso Lio Lso Lio 60 dBA 65 dBA 50 dBA 1 55 dBA For the past 10 years, Tiller has been conducting sound level monitoring and predictions for the Site and other facilities that they operate in Elk River, Livonia Township and in Maple Grove. Similar processing, loading and trucking equipment are utilized at all of the facilities. Tiller has demonstrated the ability to comply with the nighttime noise standards. This information has been presented to cities and counties and Tiller is allowed nighttime operations at these facilities. Although sound levels vary with distance and topographic changes, the monitoring and predictions conclude that these facilities can operate in compliance with the noise standards at residential receptors located at similar distances to those at this Site. Figure 3 - Site and Surrounding Area is an aerial photograph that illustrates the location of the Site with respect to the surrounding area which includes a city park, mining operations and residential areas. 7. Hours of Operation for Loading and Trucking: There have been a number of projects served by the Site that have required earlier loading and trucking times. In these instances we have requested specific permission from appropriate staff to extend our hours and accommodate these projects. The majority of these requests have been for a 6:00 A.M. start versus 7:00 A.M. Although there are a small number of requests for overnight loading and trucking, these are usually for major highway projects that are done during nighttime hours to avoid conflicts with the travelling public. A recent example is the Hwy 10 and Armstrong Blvd interchange in Ramsey. A large amount of material for that project was loaded, trucked and delivered from the Site to the project during nighttime hours. Tiller staff, and to our knowledge, City staff have not received any comments or complaints when the Site is utilizing extended hours even for larger overnight projects. 8. Request: Tiller is respectfully requesting an amendment to the existing CUP for the Site that will allow loading and trucking operations to occur from 6:00 A.M. to 7:00 P.M. Monday through Saturday. No other changes are being sought for any aspect of the CUP. Tiller Corporation: Elk River Sand and Gravel Mine 2 1 P a g e Conditional Use Permit Amendment Application May 2017